Hyacinths, best planted in the fall 6-8 weeks before the first hard frost (early September in the Ozarks), are beloved by many for their clusters of fragrant flowers in March and April. Some varieties will naturalize in ours garden, but their bloom tends to decline with the years, so many gardeners treat them as annuals and replant every year. Note: Summer Hyacinths can be planted in March for bloom in July.